Guard attachment for molding-machines.



No. 671,212. x Patented Apr. 2, 190i. J. H. HOUT 8. W. H. GRUTH US.GUARD ATTACHMENT FOB MOLDING MACHINES.

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llNTTnn STATES t JOHN H. HOUT AND WILLIAM H.

PATENT @FTTCE.

GROTHUS, OF COLUMBUS, OHIO.

GUARD ATTACHMENT FOR MOLDING-MACHINES.

SPEGIFIOATION formingpart of Letters Patent No. 671,212, dated April 2,1901.

Application filed April 9, 1900.

T0 (ZZZ whom it may concern:

Be it known that we, JOHN H. I-IOUT and WILLIAM H. GROTHUS, citizens ofthe United States, residing at Columbus, in the county of Franklin andState of Ohio, have invented a certain new and useful Improvement inGuard Attachments for Molding-Machines, of which the following is aspecification.

Our invention relates to safety attachments for the bit-carryingspindles of woodworking machinery,such as molding-machines or shapers;and the objects of our invention are to provide a feed-guard or safetyattachment whereby the danger of the fingers of the operator of themachine being cut is reduced to a minimum, to construct said attachmentin an inexpensive and simple form, and to prod uce other im provements,the details of which will be more fully pointed out hereinafter. Theseobjects we accomplish in the manner illustrated in the accompanyingdrawings, in which- Figure l is a view in elevation of a knife or hitcarrying spindle having our improvement thereon and showing a portion ofthe machinetable in section. Fig. 2 is a plan view of our safetyattachment, and Fig. 3 is a vertical section of the safetyattachment andthe adjoining rings or collars.

Similar numerals refer to similar parts throughout the several views;

1 represents one of the usual bit or knife carrying spindles, the latterbeing provided with the usual or desirable form of upper and lowerknife-retaining collars or heads 2 and 3, between which are supported inthe usual manner the inner portions of suitable bits or cutting-tools 4.At a point on the spindle below the knives or bits and immediatelybeneath the table or top plate 5 of the machine we provide a ring orcollar 6, which, although neatly fitting abo at said spindle, issufliciently loose thereon to admitof its being rotated independently ofthe latter. Fitting in a corresponding manner aboutthisring 6 is a collar 7, the body of the latter preferably being of less thicknessorheight than the ring 6, which it surrounds and with which it is held inengagement by friction. The outer edge of the collar 7 is provided onone sidewith an outwardly-projecting cam-body 8, the outer surface ofthe latter, which is of greater height Serial No. 12,045. (No model.)

above described, is preferably roughened or toothed, as indicated at 9,for the purpose hereinafter set forth, while the upper and lowersurfaces thereof may be recessed, as indicated at 10, to impartdesirable lightness thereto. From the lower side of the cam projection 8we cause to extend a stop-pin 11. Below the ring or collar 6 wepreferably provide the spindle, above the head of the boxing 12, withthe usual collar 13, and below the latter, on said boxing-head, weprovide a fixed ring 14, having an upward stop projection 15 on itsperiphery, the latter being in the path of the stop-pin 11 when thecollar 7 is rotated.

In utilizing the above-described invention for the purpose of reducingthe danger of having the fingers of the operator injured by the knivesthe strip or body of Wood to be cut by said knives is instead of beingstarted, as usual, against a collar of equal thickness on the spindleplaced in contact with the serrated surface of the wider portion of thecam projection 8, said strip being gradually forced inward and thecollar 7 rotated until the strip to be out, following the inward curveof the surface of the cam 8, is against the body of the ring 7 andsubject to the cutting action of the knives or bits.

In case, as often happens with machines of this class, the knives stickor catch in the wood which is being operated on the wood will be thrownoutward by the movement of the cam toward the operator, so that thehands of the operator, which are grasping the wood, will be brought outof the path of the knives. This outward movement of the wood isaccomplished partly through the engagement thereof with the serratedsurface of the cam projection and partly through frictional engagementof the inner ring 6 and ring 7 and a corresponding engagement of saidring 6 with the spindle, the latter being rotated toward the operator.Although the ring 6 is rotatably mounted upon the spindle, asufficiently close fit is attained between these parts to insure themovement of the rings 6 and 7 with the spindle when the ring 7 isreleased from pressure of the work. It will thus be seen that the deviceherein described serves to secure the safety of the 0perators hands inhandling the strip to be cut during the feeding of said strip intoengagement with the knives, and, further, serves to throw the work andhands of the operator out away from the knives in case of a stoppage ofthe cutting action or splitting of the wood.

It will be seen that the outward-swinging or return movement of the ring7 will be limitedby the engagement of the pin 11 with the ringprojection 15, said pin being normally in engagement with said ringprojection.

Although We have described the ring 13 in connection with the deviceherein shown, it is obvious that any desired number of collars or ringsmight be employed above or below the safety-collar as the character ofthe machine or occasion might require. It is also evident that while theemployment of the inner ring 6 is considered desirable said ring 6 maybe omitted and the ring 7 made to fit loosely about the periphery of thespindle. It will be observed that our improved safety device is simplein construction and that the same may be produced at a low cost ofmanufactu re and readily connected with any of the ordinary forms ofbit-carrying spindles.

Having now fully described our invention, what we claim, and desire tosecure by Letters Patent, is-

In a safety attachment for bit or knife carrying spindles, thecombination with the spindle and bits, of a collar rotatably mounted onsaid spindle, and having a sufficient frictional engagement therewith toinsure its rotation with the spindle when the collar is released fromexternal pressure said collar having a cam projection extendingtangentially therefrom, substantially as specified.

JOHN H. HOUT. WILLIAM H. GROTHUS.

In presence of R. G. HESSONG,

A. L. PHELPS.

